I like the low profile design - Unity Tactical Modbutton Lite Single Lead Surefire 4.5in Switch

The design for how it fits in your rifle is great. Gives me a proper grip with a thumb pad I can just squeeze if I want light. Works fine. The mounting system is wonky and very cheap but works. I wouldn’t use this in a hard use rifle but works fine for non hard use. I would expect this plastic to break under hard conditions, it’s rather flimsy. However with you being able to get a very low profile button on your rail that works just fine I would buy this again for another rifle. It just feels more comfortable to me than a Surefire button. Another problem is how annoying it was to set up. The nuts are tiny and very easy to loose. The screws are tiny too. I wouldn’t tighten this too tight I’d be scared the head would pop off the screws. Just throwing that out there. Was able to torque mine down to 20 in/lb no problem though.